Net Loss Per Common Share (Narrative) (Details)			1 Months Ended	12 Months Ended
	Apr. 24, 2017 shares	Apr. 08, 2016 shares	Sep. 30, 2017 $ / shares shares	Dec. 31, 2017 USD ($) shares	Apr. 23, 2017 shares	Dec. 31, 2016 shares
Remaining shares authorized for issuance	67,000,000			67,000,000	670,000,000	67,000,000
Change in fair value of November 2016 warrants | $				$ (1,524,000)
Conversion ratio of reverse stock split	10
November 2016 Warrant Derivative Liability [Member]
Exercise price of warrants | $ / shares			$ 0.57
Common Stock Issuance Agreement [Member]
Remaining shares authorized for issuance						28,684
Shares issued per agreement		85,346	523,210